1265637264 has 20 divisors (see below), whose sum is σ = 3269563056. Its totient is φ = 421879072.

The previous prime is 1265637257. The next prime is 1265637277. The reversal of 1265637264 is 4627365621.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13183674 + ... + 13183769.

Almost surely, 2^1265637264 is an apocalyptic number.

It is an amenable number.

1265637264 is an abundant number, since it is smaller than the sum of its proper divisors (2003925792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1265637264 is a wasteful number, since it uses less digits than its factorization.

1265637264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26367454 (or 26367448 counting only the distinct ones).

The product of its digits is 362880, while the sum is 42.

The square root of 1265637264 is about 35575.7960416910. The cubic root of 1265637264 is about 1081.6906715956.

The spelling of 1265637264 in words is "one billion, two hundred sixty-five million, six hundred thirty-seven thousand, two hundred sixty-four".